gtk: Some code cleanup for the message-pump.

base/message_loop/message_pump_aurax11.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef BASE_MESSAGE_LOOP_MESSAGE_PUMP_AURAX11_H
 #define BASE_MESSAGE_LOOP_MESSAGE_PUMP_AURAX11_H
 
 #include <bitset>
 #include <map>
 
@@ skipping 40 matching lines @@
   void AddDispatcherForWindow(MessagePumpDispatcher* dispatcher,
                               unsigned long xid);
   void RemoveDispatcherForWindow(unsigned long xid);
 
   // Adds/Removes |dispatcher| to receive all events sent to the X root
   // window. A root window can have multiple dispatchers, and events on root
   // windows will be dispatched to all.
   void AddDispatcherForRootWindow(MessagePumpDispatcher* dispatcher);
   void RemoveDispatcherForRootWindow(MessagePumpDispatcher* dispatcher);
 
+  // Adds an Observer, which will start receiving notifications immediately.
+  void AddObserver(MessagePumpObserver* observer);
+
+  // Removes an Observer.  It is safe to call this method while an Observer is
+  // receiving a notification callback.
+  void RemoveObserver(MessagePumpObserver* observer);
+
   // Internal function. Called by the glib source dispatch function. Processes
   // all available X events.
   bool DispatchXEvents();
 
   // Blocks on the X11 event queue until we receive notification from the
   // xserver that |w| has been mapped; StructureNotifyMask events on |w| are
   // pulled out from the queue and dispatched out of order.
   //
   // For those that know X11, this is really a wrapper around XWindowEvent
   // which still makes sure the preempted event is dispatched instead of
@@ skipping 14 matching lines @@
 
   // Sends the event to the observers. If an observer returns true, then it does
   // not send the event to any other observers and returns true. Returns false
   // if no observer returns true.
   bool WillProcessXEvent(XEvent* xevent);
   void DidProcessXEvent(XEvent* xevent);
 
   // Returns the Dispatcher based on the event's target window.
   MessagePumpDispatcher* GetDispatcherForXEvent(const NativeEvent& xev) const;
 
+  ObserverList<MessagePumpObserver>& observers() { return observers_; }
+
   // Overridden from MessagePumpDispatcher:
   virtual bool Dispatch(const NativeEvent& event) OVERRIDE;
 
   // The event source for X events.
   GSource* x_source_;
 
   // The poll attached to |x_source_|.
   scoped_ptr<GPollFD> x_poll_;
 
   DispatchersMap dispatchers_;
 
   // Dispatch calls can cause addition of new dispatchers as we iterate
   // through them. Use ObserverList to ensure the iterator remains valid across
   // additions.
   ObserverList<MessagePumpDispatcher> root_window_dispatchers_;
 
+  // List of observers.
+  ObserverList<MessagePumpObserver> observers_;
+
   unsigned long x_root_window_;
 
   DISALLOW_COPY_AND_ASSIGN(MessagePumpAuraX11);
 };
 
 typedef MessagePumpAuraX11 MessagePumpForUI;
 
 }  // namespace base
 
 #endif  // BASE_MESSAGE_LOOP_MESSAGE_PUMP_AURAX11_H